James casey



No. 624,624. Patented May 9, 1899.. J. CASEY. AUTOMATIC CHOKE EEEIJDEVICE FOR LUBR IGATOBS.

(Application filed. Mar. 26, 1897.)

(N0 Modal.)

y r. e a m 7% e fl y h M2772 eases frfg 'mz imams FETERS cu PHDTO-LITHQ,WASNWGTON, n c.

NITED STATES PATENT OFFICE.

JAMES CASEY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE-HALF TO JAS. F.WILLIAMSON, OF SAME PLACE.

AUTOMATIC CHOKE-FEED DEVICE FOR LUBRICATORS.

STECIFICATION forming part of Letters Patent No. 624,624, dated May 9,1899.

Application filed March 26, 1897. Serial No. 6295332. (N0 inod'eli) Toall whom it may concern.-

Be it known that I, JAMES CASEY, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inAutomatically-Adjustable Choke-Feed Devices for Cylinder-Lubricators;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention has for its object to provide an improved choke-feed forcylindei lubricators.

The choke-feed now in general use on cylinder-lubricators will afiectthe feed of the oil to the valve-chest and cylinders in sufficientquantities as long as there is sufficient difference of pressures in thelubricator and in the cylinder-pipe. Otherwise stated, as long as thethrottle-valve is partly closed the ordinary choke-feed will supply theneeded oil; but if the throttle be wide open, as when the engine isdragging a heavy load on asteep grade, or for any reason, the pressurein the Valve-chest and cylinder-pipe will approximate so closely to thatin the lubricator that sufiicient oil will not be fed through theordinary choke-plug. Still, otherwise stated, if the contracted passagein the choke-plug be adapted for the desired supply of oil, when workingthe engine with the steam more or less throttled, the lubricator willnot supply sufficient oil when the throttle is wide open.

My invention has for its object to overcome this defect, which Iaccomplish by providing a choke-feed of extremely simple construction,which will automatically adjust itself so as to afford a free andsufficient supply of oil under all conditions.

To these ends my invention consists of the novel features hereinafterdescribed, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein likeletters refer to like parts throughout the several views.

Figure 1 is a view, chiefly in longitudinal central section, through myimproved chokefeed and the pipe connections containing the same, withthe feed devices in the position which they will occupy when using steammore or less throttled. Fig. 2 is a similar view of the same parts withthe feed devices shown in the position which they would assume when thethrottle-valve is wide open. Fig. 3 is a view in perspective showing'thefeed devices detached and'pulled apart from each other.

The reference-letter a. represents a part of the lubricator.

a represents a fitting connecting with the lubricator and containing thechoke-feed devices.

a represents a fitting connecting the fitting a and the cylinder-pipe a.The parts a and C63 are united bya suitable coupling a, which affords atight joint. The fitting a is equipped with an ordinary oil-cup a.Having regard now to the choke-feed devices, the fitting a is suitablybored out to afford a seat for a choke-block b and a differential pistonc. The choke-block b is fixed in the fitting a. at the cylinder end ofthe same, and the differential piston c is free for limited movement inthe bore of the same on the lubricator side of the choke-block h. Thechoke-block Z2 is provided with a choke-plugb', having the ordinarycontracted or choke passage 19 The choke-block?) is also provided withone or more by-passages 19 As shown,

, there are several of these by-passages b andthe choke-block iscounterbored, as shown at 19 The choke-plug b is shown as projectingtoward the differential piston beyond the end of the body of the blockand as provided with a conical end. The differential piston c isprovided with a central passage 0, of considerably larger size than thechokepassage 19 in the choke-plug b. The passage 0 in the pistonterminates in a bell-mouth 0 which is adapted to fit over the conicalend of the choke-plug b when the parts are in the position shown inFig. 1. The smaller member a of the differential piston faces thelubricator and is subject to lubricator-pressure. The larger member 0 ofthe differential piston faces the choke-block b and is subject tocylinder-pressure through the passages 12 in the choke-block b. Invirtue of this construction and disposition of the said choke-feeddevices the action will be as'follows: Within the predetermined limit ofvariation between the pressure in the lubricator and the pressure in thecylinder-pipe, or, otherwise stated, when the steam is being throttled,the parts will be held in the position shown in Fig. 1 by thesufficiently greater pressure from the lubricator on the smaller pistonmember 0 and when the said parts are in said position (shown in Fig. 1)it is obvious that the larger passage 0 in the piston a can onlycooperate with the contracted or choke passages 12 in the choke-plug b.Whenever the pressure in the cylinder-pipe increases beyond thepredetermined limit of variation, so as to approximate the pressure inthe lubricator, the parts will be moved into the position shown in Fig.2 in virtue of the larger size of the differential piston member 0 andwhen this occurs itis obvious that the larger passage 0 in thedifferential piston will cooperate with all the passages in thechoke-blockb. In virtue of the increased aggregate area of the passagesthus rendered available through the choke-block b it is obvious that amuch larger quantity of steam will be permitted to flow through from thelubricator into the cylinder-pipe. Hence, although the pressure in thecylinder approximates that in the lubricator, sufficient oil will becarried through for lubricating the engine-valves and the cyliuderunderthe reductions which take place from the movements of the engine-piston.

From the foregoing description it must be obvious that if the parts beproperly proportioned my choke-feed may be made so as to deliver asubstantially uniform amount of oil to the valve-chest and cylinderunder all conditions of the steam-pressures. Otherwise stated, when thesteam is being throttled the parts will occupy the position shown inFig. 1 and my improved choke-feed will operate like the ordinarychoke-feed, supplying the oil through the contracted passage of thechokeplug 1) only; but when the throttle is wide open, so that thepressure in the valve-chest and cylinder-pipe approximates much morenearly to that in the lubricator, the parts will assume the positionshown in Fig. 2, so as to render the larger area of openings availablethrough the choke-block b, and thereby permitting the desired feed ofthe oil from the lubricator. My choke-feed is therefore auto narychoke-feed, as stated at the beginning of this specification, and byactual usage I have demonstrated that my improved chokefeed hereindisclosed overcomes the said de feet and affords the free andsubstantially uniform feed of the oil under all conditions.

. What I claim, and desire to secure by Letters Patent, is as follows:

1. An automatically-adj ustable choke-feed for cylinder-lubricators,comprising a fixed choke-block having a choke-plug and one or moreby-passages, and a differential piston, 0n the lubricator side of saidblock, with its smaller member subject to lubricator and its largermember subject to cylinder-pressure, the said differential piston havinga passage of larger size than the choke-passage in said plug, with saidparts so arranged that, under the normal difference of pressures saidpiston seats on said plug and its passage cooperates with thechoke-passage in said plug only, but that whenever said difference ofpressures becomes less than normal, said piston moves away from saidplug and its passage cooperates with all of the passages in thechokeblock, substantially as and for the purposes set forth.

2. The choke-feed, for cylinder-lubricators, comprising a suitablecasing a, the fixed choke-block I) having the choke-plug Z) withchoke-passage b and provided also with the by-passages b thedifferential piston c on the lubricator side of said block having thepassage c of larger size than the choke-passage W, with its smallerpiston member c subject to lubricator-pressure and its larger member 0subject to cylinder-pressure, and said piston being arranged to seat onsaid plug, under the normal difference of pressures and to move awayfrom said plug when the difference of pressure becomes less than normal,substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

. JAMES CASEY. WVitnesses:

J AS. F. WILLIAMSON, BEssIE B. NELSON.

